Burglar alarm



HAWLZUG J. E. BOND BURGLAR ALARM Filed June 28. 1921 Patented July 10, 1923. I

v UNITED? STATES PATENT oFFicE.

JAMEs'nDw Rn Bonn; or SAWTELLE, CALIFORNIA.

BURGLAR ALARM.

{Application filed June 28, 1921. Serial No. 480,986.

. To all whom it may concern: 7 l

dow-frame and to be operated to sound an alarm wheneverfthe. door or window is opened a short distance.

. An object of this invention is to construct a simple alarm ofthis character which will be. safe, convenient to attach and set, and certain of operation when the window or door isopened.. 1 t p p a 7 Another. objectis tosaiely use cartridges 0 her ob'ects, advantages and: features of invention may appear from the accompanyingdrawing, the subjoined detail description and the appended claims. .1

The accompanying drawing'illustrates the invention.

Figure 11 is a l enlarged side elevation partlyin'sectmn showing the nvention n position onfth'e frame of an opening which may be that of a door or of a window. Fragments of said frame are. shown and afrag- 'ment of a door is shown in. clcsed position and dash lines indicate the position of said door just beforethealarm is given. Broken lines indicates the firing position of the hammer.

Fig. 2 is a sectional elevation on line 00 vFig. 1,.lo'oking in .the direction of the ar- Fig. 3 is a side elevat on of ,the alarm closed.

The basesl is adapted to fitupon a frame 2 forthe opening 3 that is tobe closed by the closure 4:. In the drawings the frame,

opening and closure. are illustrated as pertaining to a door. Said base 1 is provided with a hole 5. through which a screw 6 is exi -tended tofasten the base 1 to the frame 2.

Said .base' is provided with achamber 7 ter- 'minating in a threaded seat 8 and communieating with the outside of thebase through a port 9. A cartridge holder 10 is externally threaded as at .11 at one end andhasan internally threaded socket 12 and said socket ris exte'nded in a smooth bore 13-which comm micates with the cartridge chamber 7 and is, adaptedto receive a cartridge which hammer 17 on its pivot 18. Said spring is given an appropriate tension and is arranged to apply such tension to the hammer by means of the operating rod 22 which telescopes in a tube member 23 that isloosely seated inthe socket 24 and is provided with a, shoulder'25 to seat the spring 21, which inturn operates uponthe shoulder 25 on saidrod. 22, that is pivoted by the pin 26 to the heel of the hammer at a distance from the hammer pivot 18. The shoulder 25 on the end of the rod 22 serves as a stop for the hammer when the pivot 26 is stationed toward the pin 16, and beyond a line drawn from the hammer pivot 18 to the pivotal seat 24 of the tube 23. By the arrangement thus shown, the hammer may be easily cocked into the position shown in F ig.v 1 and because of the disalinement of the pivot pin 26 relative tothe pivot 18 and the socket 24, the rod, spring and telescoping tube 23, a portion ofthe surface of the hammer on the side opposite the breech block 15 is extended beyond the base oblique to the path of the object which is to set off the alarm.

In the case ofthe door 4. as shown, the opening of the same will force the hammer 17 toward the breech block until the pivot 26 is drawn backward beyond the plane passing through the axis of the pivot 18 and the socket 2 1 and thereupon the force of the spring 21 is actuated. to force the telescoping pin up and to drive the hammer face 20 down forcibly onto the firing pin 16. a

In practice the base will be set with its rear margin 27 at the margin of the opening 3 of the frame member against whichthe free edge of the closure 4: comes to rest when closed.

In case the closure is moved from its closed position as indicated by the dotted lines in Fig. 1, it will operate upon the oblique surface of the hammer 17 and bring the spring and telescoping pin into position, to actuate the hammer and discharge the cartridge. A chamber 7 in the base is provided with an orifice 9 to which the force oi any explosion in the chamber 9 will be extended and directed. a

It is understood that this orifice may be variously located; in the form shown it is in the under side of the base as applied to the door frame so that when the cartridge is shot off the force of the explosion will be directed doivniva-r'd by said orifice. I To reset the alarm all that is necessary simply to unscrew the breech block hem the baseand from the cartridge holder then the cartridge may be pushed out by a suitable instrument and a new cartridge in serted.

I claim. a

1. A burglar alarm comprising a base having a cartridge holder; a firing pin ari'ahged to discharge a cartridge in said holder; a post secured to said base; a hammer pivot-ally connected to said post and ari'tnged to engage said firing pin; and a spring arranged to operate the hammer.

2 The combination With a base and chamber and a cartridge holder adapted to hold the cartridge in position to lire into said chamber; a firing pin to discharge said cartridge"; a pivotally mounted hammer connected to the base; an oscillating spring connected to the hammer and adapted to cause the same to strike the firing pin; and means ivhereby said spring is oscillatable from and to a position in which it holds the hammer cooked, and to and from a position in which it will drive the hammer to strike the firing plIl;

3; A burglar alarm provided with a operated haiiiiher pivoted to a suppert arid having a bendadapte'd to stand in the path of a deer or window and means to yieldingly' hold said beiid in such path and to releasesaid hammer when such bend is pushed out of said path substantially as and for the purpose set forth.

4. In a burglar alarm provided with a cartridge holder and a firing pin and a support for a hammer; a hammer pivoted to saidjs'up pert; a telescoping operating rod pivoted to the hammer and a spring operating in the direction or said rod to operate the hammer, the pivot between the rod and the hammer ,being arranged to pass dead center relative to the pivot of the hammer ivhen the hanimer is cooked, and said hammer being adapted to be moved by the opening of door or wind'ow to carry the rod pivot beyond said dead center so that the spring may then operate the hammer to "actuate the firing pin.

'5. In aburglar alarm the combination with a support and a hammer pivoted to said support, of a spring acting upon the lrainmer at a point adapted to pass dead center relative to the pivot of the hammer frame, said base having a cartridge cham- I ber therein; a cartridge holder having a bore in communication with the cartridge chamber and adapted to receive a cartridge; a breach block in threaded engagement with said cartridge holder and having a firing pin for discharging a cartridge in the chamber of said base, a post, a hammer ivotally connected to said post for striking said firing pin, and means operated by a door or Window for actuating said hammer.

7. A burglar alarm comprising a base adapted to be attached to a door or WlIidOW frame and having a cartridge chamber therein, a firing pin for discharging a cartridge in said chamber; a spring; a bifurcated post secured to said base; a hammer pivotally mounted in said post, said hammer adapted to be held in stril'rin'g' position by said spring, and means; whereby opening of a door or Window will cause saidspring to actuate said hammer to strike said pin.

8. A burglar alarm comprising a base adapted to be attached to a door or wiaaew frame, said base having a cartridge chamber therein, a firing pin for discharging a cartridge in said chamber, a bifurcated post secured to said base, a hammer pivoted to said post and having a shoulder, a rod pivoted to said shoulder, a tube telescoping said rod and pivetauy corinected tosaid post; a spring under tension arranged between. the pivoted end of said rod and the base of said tube; said spring adapted to hold said hammer in striking position and means whereby opening of a door or Window ivill cause said spring to actuate said hammer against said 'pin.

9. A burglar alarm comprising a base adapted to be attached to a door or Window frame said base having a cartridge chamber therein, a firingpin for discharging a cartridg'e in said chamber; a bifurcated post secured to said base; a hammer pivoted to said post and provided with a shoulder; a rod pivotally connected to said shoulder; a tube telescoping said rod and movably seated in a socket between the limbs of said post; a spring under tension arranged between the ivoted end er said rod and the seat of 'sait tube, said springibeing adapted t hold said hammer in striking position 'With said shoulder abutting a step on said post and the pivot pin of said rod and shoulder "ofi' center to a line through the spring will strike said hammer against said 10 firing pin for the purpose specified.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 17th day of June, 1921.

JAMES EDWARD BOND.

Witness:

JAMES R: TOWNSEND. 

